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RESEARCH PRODUCT
Determination of helium number densities in high-frequency electrodeless plasma
Zanda Gavaresubject
PhysicsNuclear and High Energy Physicschemistry.chemical_elementPlasmachemistryMetastabilityExcited stateEmission spectrumAtomic physicsInductively coupled plasmaAbsorption (electromagnetic radiation)SpectroscopyInstrumentationHeliumdescription
Abstract The number densities of He first excited states 2 3 S 1 , 2 1 S 0 , 2 3 P 0,1,2 , and 2 1 P 0 were measured by absorption and self-absorption methods. The emission lines in the range 290–730 nm were used to determine the number densities of He metastable and resonant states of inductively coupled high-frequency electrodeless lamps filled with helium at pressure 0.1 Torr. The obtained number densities of helium metastable levels 2 3 S 1 and 2 1 S 0 are 2×10 12 and 3×10 11 cm −3 , respectively. For the 2 3 P 0,1,2 and 2 1 P 0 levels the determined number densities are ten times smaller than that of the metastable levels. Values of number densities from measurements using both methods are in good agreement.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2010-11-01 | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment |